Life rule: when you tell someone a secret, it is no longer a secret. Do not be shocked if you hear it everywhere. Always expect it to become public information as soon as you disclose it. If you wanted it to be kept secret, you would have kept your mouth shut about your private matters.

On topic - most guys I know from high school did that. It’s very basic and horny teens do anything to appease their Hormonal Overlords. Both guys and girls.